﻿<?xml version="1.0" encoding="utf-8"?>
<xs:schema
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	targetNamespace="A"
	xmlns:A="A">

  <xs:attribute name="a">
    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:enumeration value="a"/>
        <xs:enumeration value="b"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>  

</xs:schema>